Formation of gear-wheel teeth.



C. AI PARSONS (QS. S. COOK..

FORMATION 0F GEAR WHEEL TEETH.

APUCATION FLED NOV. 6,1916. l 1,220,543` Patented Mar. 27,1917.

Cha/rk@ AParsom UNITED STATES PATENT OFFICE.

CHARLES ALGERNoN PARSONS, or NEWCASTLE-UroN-TYNE, AND STANLEY SMITH coox, 0E WALLSEND, ENGLAND; SAID coox AssIGNoR To SAID PARSONS.

- FORMATION on GEAR-WHEEL TEETII.

Original applications To all whom it may concern:

Be it known that we, CHARLES -ALGERNON PARSONS, a subjectof the King of Great Britain and Ireland, and residing at Heaton AWorks, Newcastle-uponlTyne, the county of Northumberland, England, and STANLEYSMITH Coon, a subject ofthe King of Great Britain and Ireland, and residing at Turbinia Vorks, VVallsnd-on-Tyn, ,in the county of Northumberland, England, have invented certain new and useful Inh4 provements in and Relating to the Formation of Gear-Wheel Teeth, of which the fol lowing is a specification.

This invention relates to the method of and means for forming the teeth of gear wheels such asvare described in the co pending application Serial No. 105,756, filed 24th June, 1916.

'Referring to the accompanying. draw ings A Figure 1 is a side elevation, and

Fig. 2 is a Aplan of a portion'of a gear cutting machine embodying the present invention.

In carrying the invention into eii'ect, the work u is mounted on a table cto which are attached two driving spur wheels 7 and 8.` These spur wheels are driven by pinions 5 and 6. ,The wheels 7 and 8 preferably have Single helical teeth and trains of helical Spur wheels and pinions are carried around to the front of. the machine where they en; gage with a pair of pinions d mounted upon a' common. vertical shaft e. These latter .pinions are of opposite hand and the shaft e being allowed a certain small longitudinal freedom, a dilierential action takes place so that these pinions transmit equal force to Specification of Letters Patent.'

the two trains and consequently to the two wheels 7 and 8. In this manner the angular movement of the work fu, is made to register which would be introduced by any of the separate drives are eliminated'or at least greatly reduced. The power isl transmitted to the vertical shaft e through the shaft a and bevel Wheels. d.

It will beseen that the relative position of .the member c for-ming the teeth and the wheel on which the teeth are being formed is' determined by the general or average configuration of themembers 7 and 8 of the| parent gear.

Having now described our invention, what we claim as new and desire to secure by Letl ters Patent, is:

1..In combination in a gear cutting machine, a work table, spiral gear wheels attached to Said table, spiral gear driving means engaging saidwheels, a power shaft adapted to rotate and free to move longitudinally, a pair of pinions of opposite angle secured upon said shaft and acting to con- 2. In combination-in a gear cutting machine, -a work table, vspiral gear. lwheels at'- Patented Mar. 27, 1917.

iledv March 25, 1913, Serial No. 756,760, and .Tune 24, 1916, Serial No. 105,756. Divided and this application filed'lovember 6, 1916. Serial No. 129,884.

with the average configurationof the' parent .gears 7 and 8, and consequently the errors tached. to said table, spiral gear driving I means engaging said wheels, a power shaft adapted to rotate and free to move longitu- (inally, gear meansof opposite angle se-l i ned upon said shaft and acting to connect said shaft to said spiral driving means.

In testimony whereof, we have-affixed our signatures.

STANLEY SMITH 000K.

CHARLES ALGERNON masons. *l

65 nect said shaft to said spiral driving means. 

